What conditions share symptoms of Fibromyalgia?
Many of the symptoms of fibromyalgia mimic those of other diseases, such as low thyroid hormone production (hypothyroidism), polymyalgia rheumatica, neuropathies, lupus, Lyme’s disease, multiple sclerosis and rheumatoid arthritis. In addition, fibromyalgia often coexists with other chronic pain and fatigue syndromes, such as Chronic Fatigue Syndrome (CFS) and Myofascial Pain Syndrome (MPS).
Source:
Fibromyalgia Resource Information
http://www.fibrofactpage.com/symptoms5.html